A man, center, supervises a dancing group during a mass folk dance in front of the Pyongyang Indoor Stadium in Pyongyang, North Korea, on April 15, 2013. Oblivious to international tensions over a possible North Korean missile launch, Pyongyang residents spilled into the streets Monday to celebrate a major national holiday, the birthday of their first leader, Kim Il Sung.

A child covers the eyes of her father as she sits on his shoulders watching mass folk dancing in front of Pyongyang Indoor Stadium on April 15, 2013.

Singers gesture on the stage while a photo of the late leaders Kim Il Sung, right, and his son Kim Jong Il is projected in the background during a performance held on the eve of the birthday of the former at a theater in Pyongyang on April 14, 2013.

North Korean leader, Kim Jong Un, center, visiting a mausoleum for his deceased father and grandfather at the Kumsusan Palace of the Sun in Pyongyang on April 15, 2013.

Effigies of North Korea's leader Kim Jong Un (L), and his father Kim Jong Il (R), which were later burnt, are seen during a rally in Seoul, South Korea, on April 15, 2013.

A South Korean soldier aims his machine gun as a passenger passes through a ticket barrier during an anti-terrorism drill at a subway station in Seoul on April 15, 2013.

A man takes a photo with his iPad as South Korean soldiers take their positions during an anti-terror and security drill at a subway station in Seoul on April 15, 2013.

Marathon runners pass by a long row of North Korean soldiers as they cross a bridge in Pyongyang on April 14, 2013. North Korea hosted the 26th Mangyongdae Prize Marathon to mark the upcoming birthday of Kim Il Sung.

North Korean military officers watch a marathon runner at Kim Il Sung Stadium in Pyongyang on April 14, 2013.

A South Korean employee, top right, working at the Kaesong Industrial Complex (KIC), speaks to the media upon his arrival at South Korea's CIQ (Customs, Immigration and Quarantine) office, just south of the demilitarised zone separating the two Koreas, in Paju, north of Seoul, April 3. North Korean authorities were not allowing any South Korean workers into a joint industrial park on Wednesday, South Korea's Unification Ministry and a Reuters witness said, adding to tensions between the two countries.

A man uses his mobile phone in front of a specialty shop selling North Korean products, at South Korea's CIQ (Customs, Immigration and Quarantine) office, just south of the demilitarised zone separating the two Koreas, in Paju, north of Seoul, on April 3. North Korean authorities were not allowing any South Korean workers into a joint industrial park on Wednesday, South Korea's Unification Ministry and a Reuters witness said, adding to tensions between the two countries.

South Korean soldiers patrol at the border with North Korea in the Demilitarized Zone (DMZ) near Imjingak in Gyeonggi-do Province, South Korea, on April 2. North Korea said it plans to restart its five megawatt nuclear reactor that was shut down under an agreement reached at the six-party talks in 2007, a move that will allow the North to extract plutonium from spent fuel rods.

South Korea soldiers inside transit office at the Military Demarcation Line (MDL) near the demilitarized zone (DMZ) in Gyeonggi province, South Korea, on April 3. North Korea on April 3 blocked South Korean employees from entering the industrial complex operated jointly by the two countries, only allowing workers to leave, a Seoul official said.

A US Air Force F-22 Raptor takes off at Osan Air Base, south of Seoul, South Korea, on April 3. The US military said it has deployed two F-22 Raptor stealth jets to South Korea as part of ongoing joint military exercises with South Korea. The deployment of the stealth jets marked the latest show of force against North Korea, which issues daily threats of war amid heightened tensions on the Korean Peninsula.

A North Korean soldier looks at the southern side through a pair of binoculars at the border village of the Panmunjom (DMZ) that separates the two Koreas since the Korean War, in Paju, north of Seoul, South Korea, on March 19. The United States is flying nuclear-capable B-52 bombers on training missions over South Korea to highlight Washington's commitment to defend an ally amid rising tensions with North Korea, Pentagon officials said.

Singer Psy, center, performs during the inauguration of South Korea's President Park Geun-hye, not pictured, at parliament in Seoul on Feb. 25, 2013.

South Korea's new president Park Geun- hye, center, salutes the national flag prior to her inauguration ceremony at the National Cemetery in Seoul on Feb. 25, 2013.

Park Geun-hye salutes during her inauguration ceremony as the 18th South Korean president on Feb. 25, 2013.

U.S. Marines and South Korean Marine Corps soldiers perform in the snow during a winter exercise in Pyeongchang on Feb. 7, 2013.

A U.S. Marine uses a weapon during the drill on Feb. 7, 2013.

South Korean and U.S. Marines on skis during the drill on Feb. 7, 2013.

A South Korean Marine, right, and a U.S. Marine, left, take part in a mock cavalry battle during their joint military winter exercise on Feb. 7, 2013.

South Korea launched a rocket on Jan. 30, 2013 in its third bid to put a satellite in orbit -- a high-stakes challenge to national pride after rival North Korea succeeded in the same mission last month.

Kim Chang-geun, right, 57, a member of an anti-Japan civic group, stabs himself in the stomach with a knife during a rally at Gimpo Airport in Seoul on Jan. 4, 2013. The rally was held to denounce Japan's conservative new Prime Minister Shinzo Abe, and demand an official apology for Japan's war crimes during the World War II.

Bleeding protester Kim Chang-geun, center, who tried to hurt himself with a knife, is escorted to an ambulance by plain-clothes policemen during a protest against the visit of a special envoy sent by Japanese Prime Minister Shinzo Abe. South Korean President elect Park Geun-hye will meet with the delegation on Friday in her first diplomatic test.